Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	$ 137,969	$ 123,569
Less accumulated depreciation and amortization, including accumulated amortization of capitalized leases	87,860	81,236
Total property, plant and equipment, net	50,109	42,333
Depreciation and amortization	6,890	9,979	9,182
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	4,862	4,764
Improvements To Land And LeaseHolds [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	24,903	23,187
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	15,834	13,715
Machinery And Equipment, Including Equipment Under Capitalized Leases [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	88,803	80,120
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment - gross	$ 3,567	$ 1,783